Chihuahua Police Dog

A long-haired Chihuahua is now a police dog in western Japan. The
brown-and-white Chihuahua was one of 32 successful candidates passing a
search and rescue test by finding a person within five minutes after merely
sniffing their cap.

http://www.telegraph.co.uk/news/worldnews/asia/japan/8148372/Chihuahua-becomes-Japanese-police-dog.htm

l